The cards in today's set really has no theme; they are just the last few that don't really go with anything else.
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Charity, is, of course, part of the overall theme of Good Will. The trick is that, Coppers can clog your deck in a high money game, so it might not be quite as helpful to other players as the name implies.
Clean Sweep has gone a few revisions, most notably from only allowing the player to discard Victory cards to allowing them to discard any cards. In that way, it is now kind of like a Cellar (from vanilla Dominion) for Actions instead of Cards. It's not particularly useful except in a game with few cards that give extra actions, so I'm considering a bonus or two; perhaps you start with +1 Action just by playing it.
Kitten is cute, and might appear useless at first, but it combos really well, especially with any cards like the new version of Gamble, or Mystic (from Dominion: Dark Ages). In some games Kitten can be more helpful than you think. Of course, being able to do basically anything with your own card is quite powerful too.
Being that these last cards are a variety of random cards, of course we must use Dominion: Cornucopia for the Suggested Set. This is "Spice of Life":
, Harvest, Horn of Plenty, Hunting
Party, Jester, Menagerie, Tournament, Young Witch Farming Village
Good Will: Charity (Witch's Bane Card), Clean Sweep, Kitten